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Approximation and Estimation Worksheet

Quantitative aptitude lesson 6: Approximation and estimation · Set 304 · 40 questions
TalentJR

The method (Round, then calculate): Round each number to the nearest ten, hundred or whole number. Do the easy sum with the rounded numbers. Pick the option nearest to it. To round a number, look at the digit after the place you keep: 5 or more goes up, less than 5 stays.

NameDateTime takenScore ___ / 40
  1. 1.Round 17.16 to one decimal place. =
  2. 2.Round 77689 to the nearest ten.
  3. 3.Which is closest to 1502 ÷ 29? (a) 50 (b) 100 (c) 25 (d) 500
  4. 4.Round 19.13 to one decimal place. =
  5. 5.Which is closest to 2093 ÷ 31? (a) 700 (b) 35 (c) 70 (d) 140
  6. 6.Round 74.68 to one decimal place. =
  7. 7.Which is closest to 603 × 30? (Round each number first.) (a) 1800 (b) 180000 (c) 36000 (d) 18000
  8. 8.Round 34.37 to one decimal place. =
  9. 9.Round 58409 to the nearest hundred.
  10. 10.Which is closest to 201 × 21? (Round each number first.) (a) 400 (b) 40000 (c) 8000 (d) 4000
  11. 11.Round 33724 to the nearest ten.
  12. 12.Which is closest to 399 + 401 + 297? (a) 1300 (b) 1200 (c) 1000 (d) 1100
  13. 13.Which is closest to 199 + 898 + 405? (a) 1400 (b) 1600 (c) 1700 (d) 1500
  14. 14.Which is closest to 600 + 103 + 503? (a) 1300 (b) 1400 (c) 1100 (d) 1200
  15. 15.Round 97.64 to one decimal place. =
  16. 16.Which is closest to 300 × 22? (Round each number first.) (a) 600 (b) 12000 (c) 60000 (d) 6000
  17. 17.Which is closest to 903 ÷ 29? (a) 300 (b) 15 (c) 60 (d) 30
  18. 18.Round 24338 to the nearest hundred.
  19. 19.Which is closest to 596 × 58? (Round each number first.) (a) 3600 (b) 72000 (c) 36000 (d) 360000
  20. 20.Which is closest to 699 × 72? (Round each number first.) (a) 4900 (b) 490000 (c) 98000 (d) 49000
  21. 21.Which is closest to 899 + 901 + 299? (a) 2100 (b) 2200 (c) 2000 (d) 2300
  22. 22.Round 91.28 to one decimal place. =
  23. 23.Which is closest to 802 + 805 + 195? (a) 1700 (b) 1800 (c) 1900 (d) 2000
  24. 24.Which is closest to 602 ÷ 31? (a) 200 (b) 10 (c) 40 (d) 20
  25. 25.Which is closest to 503 × 38? (Round each number first.) (a) 2000 (b) 200000 (c) 20000 (d) 40000
  26. 26.Which is closest to 1409 ÷ 21? (a) 700 (b) 70 (c) 140 (d) 35
  27. 27.Round 79284 to the nearest hundred.
  28. 28.Which is closest to 904 × 69? (Round each number first.) (a) 6300 (b) 63000 (c) 630000 (d) 126000
  29. 29.Round 84.13 to one decimal place. =
  30. 30.Which is closest to 500 × 21? (Round each number first.) (a) 10000 (b) 1000 (c) 100000 (d) 20000
  31. 31.Round 67471 to the nearest ten.
  32. 32.Round 25516 to the nearest ten.
  33. 33.Which is closest to 903 × 20? (Round each number first.) (a) 180000 (b) 1800 (c) 18000 (d) 36000
  34. 34.Which is closest to 902 × 82? (Round each number first.) (a) 72000 (b) 720000 (c) 7200 (d) 144000
  35. 35.Which is closest to 296 × 88? (Round each number first.) (a) 54000 (b) 2700 (c) 27000 (d) 270000
  36. 36.Round 32211 to the nearest ten.
  37. 37.Which is closest to 200 × 22? (Round each number first.) (a) 4000 (b) 40000 (c) 400 (d) 8000
  38. 38.Which is closest to 3598 ÷ 39? (a) 900 (b) 90 (c) 45 (d) 180
  39. 39.Round 30190 to the nearest thousand.
  40. 40.Round 48.62 to one decimal place. =

Answer key

  1. 17.2
  2. 77690
  3. 50
  4. 19.1
  5. 70
  6. 74.7
  7. 18000
  8. 34.4
  9. 58400
  10. 4000
  11. 33720
  12. 1100
  13. 1500
  14. 1200
  15. 97.6
  16. 6000
  17. 30
  18. 24300
  19. 36000
  20. 49000
  21. 2100
  22. 91.3
  23. 1800
  24. 20
  25. 20000
  26. 70
  27. 79300
  28. 63000
  29. 84.1
  30. 10000
  31. 67470
  32. 25520
  33. 18000
  34. 72000
  35. 27000
  36. 32210
  37. 4000
  38. 90
  39. 30000
  40. 48.6

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